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The ng_activity_mention_body notification email script is used to send emails to users who have been mentioned in journal fields. This can be used in most use cases however, is not meant to be used for knowledge approvals. Looking at the email script, we can see the following code.

On line 3, there is a reference to recordGR.getDisplayValue() which will set the email subject as the record's display value. This is an issue with knowledge approvals as these records do not have a display value. If we take a closer look at the sysapproval_approver table and look at the sysapproval field, we will notice that this field is a reference field to the task table. The getDisplayValue() function in this case would take the display value of the sysapproval field however, if a non-task record is up for approval, this field will be empty which will result in no display value being shown.

On line 4, we see that the script is trying to print a link to the record the user has been mentioned in. If the record is a knowledge approval, we see that the link will get created correctly however, there is no actual text for the link since recordGR.getDisplayValue() will return NULL so it will end up being blank. We can tell that the link is getting created correctly by navigating to the email record on the platform and parsing the email body. Once there we can see something similar to the below line of code where the link should be

You have been mentioned by "SOME_USER" in <a href='/sysapproval_approver.do?sys_id=RECORDS_SYS_ID_HERE'/></a>

Additional Information

A simple customization can be done in order to get knowledge approvals to display properly. We know that we are not able to get the display value of knowledge approvals however, we are able to get the display value of a knowledge article. Although, a sample customization will not be provided here, a simple use case would be to use the recordGR variable in the notification email script to get a GlideRecord object of the specific knowledge article. From there, you would simply output the knowledge article's display value instead of the display value of the approval without changing the predefined link since we have determined that the link displays correctly.